Hot-blast stove



` (No Model.) l y 2 Sheets- Sheet.` 1".

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H021.` BLAST gsTov.

No. 29.6.f11- Patented Appl. 1384..

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UNtTEn STATES PATENT GEEICE.

JOSEPH J. VAIREY, OF PITTSBURG, PENNSYLVANIA.

HOT-BLAST STOVE.

SPECIPICATIN forming part of `Letters Patent No. 296,101, dated April 1, 1884.

` Application filed September 18, 1883. (No model.)

. T all whom, iz? may concern.'

Be it known that I,\JosEPH J. AIREY, of

Pittsburg in thel county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Hot-Blast Stoves; and I do hereby declare that the following is a full, clear, and exact description of the invention, whichwill enable others skilled in 'the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which forma part of this specication, in which Figure 1 is a longitudinal vertical section of the stove on line y y. Fig. 2 is a transverse vertical section on linear m. Y Fig.` 3 is a detail plan section of thedoor, Snc.

`This invention relates to the construction of hot-blast stoves, and has reference both to the form of the stove `itself for maximum heating effect andto the appliances for regulating the heat and observing the same, as also Vto safety devices to prevent injury by explosion.

" ure at one end, as shown.

The invent-ion consists in thel combination and arrangement of parts, as hereinafter fully described and claimed.

A designates the primary combustion-chamber, arranged transversely of the stove struct- This chamber communicates with the flue 1,which passes back to the rear end, then communicates with another horizontal iiue, 2, which runsy forward.

and in turn communicates at its forward end with a similar tlue,3,passing backwardly again p and at the rear communicating with flue 4.

Thence an uptake, 30,enters a second tier of horizontal hues, 5, 6, 7, and 8, in reverse order, then by uptake 9 to a third tier of horizontal liues,11, l2, 13, and l4,in similar order, thence by uptake to a fourth tier of horizontaliiues, 16, 17,18, and 19, thencebyuptake to a fifth tier of horizontal fines, 21, 22, 23, and 24, whence the products of combustion pass off by flue to the chimney or stack.

It will be observed that in the horizontal tiers of ues any one flue communicates with the preceding and following fines at opposite ends only, sothat the gases and products of combustion travel the whole length of each Hue. This gives an enormous heating-surface to the stove, and is very simple and compara- 5o tively cheap. l,

The roof ofthe chamber A is arched and an inverted arch built above it, and all the heating-dues are likewise formed with a right and an inverted arch, as shown, the object being to enable the ues to resist the strainsof the occasional explosion ofthe gas which takes place when the gas is first admitted for a heat. The precise number,vertically or horizontally, of the heating ues or tiers thereof is not particular. The number will be determined by the size of the Hue-section or by the amount of air it is desired to heat. When the filles are heated to the requisiteextent, the gas is shut off and the air-blast admitted in a reverse direction by the inlet B, whence it passes through all the tlues in succession, bccoming hotter as it goes until finally it emerges from flue 1 into 'chamber A, whence it passes out by outlet C to the hot-blast pipe, 7o v and thence to the furnace. The gas-pipes and air-pipes are of course provided always with suitable valves for controlling the admission` of air and gas to the stove.

In the end wall, D, of the stoveIform openingsE opposite the ends of the various fines, as shown. Each of the openings E is fitted with a swinging door, f, hung from its upper edge to a suitable framing provided with exf tensions g. Across the extensions g,ataproper`8o distance from the door, Ipivot a leverJt, bearing at one end against the door f, and at the other end having a weight, t. The weights i are designed so as to hold the doors shut against the normal or regular pressure `of the gas `or blast, but to yield to any excessive pressure. Theconsequence is that when explosion takes place from any cause the doors f yield outwardly and prevent injury to the stove and flue structure.` Similar doors are placed at 9o the other end of the stove-one opposite the flue 11, and one in chamber A near the gas-inlet k--where, besides an explosion-valve, it serves also asa register to admit the proper amount of air to start combustion of the gas. In each of the' doors f, or in any desired number of them, I form the tubular extension m, preferably witha flaring mouth. Through m, vertically, I set a tapered rotary plug, ln, having in the line of the bore two ports, p, one of which is open, and the other closed by a suitable glass or mica partition, r, as shown in detail section in Fig. 3. Each plug a has a suitable handle, s, for operating. In the position shown in Fig. 3, the tube m is open, and a pyrometer can be inserted to test the heat in the iiue, While in a position at right angles to that shown the tube m would be closed by the glass or mica r. In an intermediate position the plug acts as an air-valve to admit any desired quantity of air to complete or promote combustion ofthe gas passing through the flu es. By arranging the chamber A transversly much greater strength and resisting power is obtained than if it were located parallel with the heating-nues.

By arranging two or more fines in vertical order, as shown, great facility exists for repairs, as, if the arches require rebuilding, (the vertical walls never needing rebuilding) the workman can begin above, and after tearing out, say, the arches between fines 24 and 16 he can stand up to the remaining work till all are removed, after which he builds the arches in in the reverse order.

I am aware that it is not new, broadly, to

construct a hot-blaststove having a number of communicating iiues-one over the other-and henceI do not claim such construction.

I claim as my invention- 1. In a hot-blast stove, the combination of a series of horizontal iiues communicating each at its end With the flue neXt adjacent, the last iiue of the series communicating by a vertical ue with a second series of similar iues above, substantially as described.

2. In a hot-blast stove, the combination of a horizontal combustion-chamber with a series of communicating fines arranged side by side and running in a direction at right angles to the direction of said combustion chamber, substantially as described.

3. In a hot-blast stove, 011e or more wallopenings communicating with the heatingfines, provided with swinging doorsf, having tubes m, and plugs a, having openings p and partition r, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

JOSEPH J. AIREY.

Witnesses:

SAMUEL BURTON, T. J. MC'IIGHE. 

